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MM: Fachverband Metall- und Materialphysik

MM 4: Liquid and amorphous materials II

MM 4.1: Vortrag

Montag, 26. März 2007, 11:45–12:00, H4

Devitrification, consolidation and mechanical properties of ball milled Al-Y-Ni-Co glassy ribbons — •Kumar Babu Surreddi¹, Sascha Sager², Mira Sakaliyska¹, Sergio Scudino¹, and Jürgen Eckert¹ — ¹IFW Dresden, Institut für Komplexe Materialien, Postfach 27 01 16, D-01171 Dresden, Germany — ²FG Physikalische Metallkunde, FB 11 Material- und Geowissenschaften, Technische Universität Darmstadt, Petersenstraße 23, D-64287 Darmstadt, Germany

In this work, glassy powders have been obtained by ball milling of Al-Y-Ni-Co glassy ribbons. The pulverization of the melt-spun ribbons was achieved by using proper milling conditions, i.e. interval-milling at low intensity, corresponding to a rather low kinetic energy, and performed at cryogenic temperature in order to retain their glassy structure and to avoid sticking of the material to the milling tools due to the high ductility of the ribbons. Due to the controlled milling conditions, the ball milled ribbons display a strikingly similar structure and crystallization behavior compared to the parent as-spun sample. The crystallization behavior and the temperature dependence of the viscosity of the as-spun and the milled ribbons were studied in order to select the proper consolidation parameters. Fully glassy and glassy-Al composite powders were then consolidated through uniaxial hot pressing and hot extrusion and finally the mechanical properties of the bulk specimens were evaluated via room temperature compression tests.